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The Influence of Metakaolinite on the Development of Thermal Cracks in a Cement Matrix

机译：偏高岭土对水泥基体中热裂纹扩展的影响

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In the paper the cluster cracks of cement paste that has been modified with metakaolinite was analyzed. The samples were loaded with an elevated temperature based on a thermal shock. To describe the crack structure, three stereological parameters were proposed to measure: (i) the cluster average area (A¯); (ii) the cluster average perimeter (L¯); and (iii) the crack average width (I¯). The computer image analysis was implemented in the study, and 4 series of samples were subjected to the examination. In two series, metakaolinite was used as a substitute for 10% of a cement’s mass. An assessment of the basic physico-mechanical characteristics of the cement matrix was also carried out. The structure of the cement paste was considered as a highly concentrated dispersion system, in which the interactions between the cement’s grains at the initial stage of the structure self-assembly affect the crack characteristics. The study has been supplemented with microstructural investigations using a scanning electron microscope and an X-ray microanalyzer. The conducted research indicated the direction of changes in the geometrical characteristics of thermal cracks if the technological variables of the material are subjected to modification. It was also confirmed that the cluster structures have fractal character and can be analyzed and observed on many levels of a structural heterogeneity.
机译：本文对偏高岭土改性的水泥浆的团簇裂纹进行了分析。样品基于热冲击加载了高温。为了描述裂纹结构，提出了三个立体学参数来测量：（i）簇平均面积（ A ？ ）； （ii）群集的平均周长（<数学xmlns：mml =“ http://www.w3.org/1998/Math/MathML” id =“ mm2”溢出=“ scroll”> <修剪> <搬运工口音=“ true“> L ¯ ）；和（iii）裂纹平均宽度（ I ？ ）。在研究中进行了计算机图像分析，并对4个系列的样品进行了检查。在两个系列中，偏高岭石被用来代替水泥质量的10％。还对水泥基体的基本物理机械特性进行了评估。水泥浆的结构被认为是一种高度集中的分散体系，其中结构自组装初期水泥颗粒之间的相互作用会影响裂缝特性。该研究得到了使用扫描电子显微镜和X射线微分析仪进行的微结构研究的补充。进行的研究表明，如果对材料的技术变量进行修改，则热裂纹的几何特征将发生变化。还证实了簇结构具有分形特征，并且可以在许多水平的结构异质性上进行分析和观察。

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